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首页> 外文期刊>Separation and Purification Technology >Photoelectrochemical oxidation of azo dye and generation of hydrogen via C-N co-doped TiO2 nanotube arrays
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Photoelectrochemical oxidation of azo dye and generation of hydrogen via C-N co-doped TiO2 nanotube arrays

机译：偶氮染料的光电化学氧化和C-N共掺杂TiO2纳米管阵列产生的氢

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Carbon and nitrogen were co-doped into TiO2 nanotube arrays (C-N-TNTAs) to extend their light response region using the chemical bath deposition method. The as-synthesized C-N-TNTAs were employed as the working anode in photoelectrochemical (PEC) experiments. Using the applied bias potential, the recombination of photo-generated holes and electrons was reduced significantly. The crystalline, optical properties, surface morphology, and structure of the C-N-TNTAs were characterized by XRD, UV-vis absorbance edges, SEM, and XPS, respectively. The XRD results showed the C-N-TNTAs were dominated by the anatase phase after sintering at 450 degrees C with significant visible light response. XPS analyses indicated nitrogen doping was mainly responsible for reducing the band gap as evidence of 0.82% N doping into the structure via the linkage of the Ti-O-N and N-Ti-O bond. SEM images illustrated the diameter of the supported TiO2 nanotubes was approximately 90-100 nm with a length of approximately 400 nm. After carbon and nitrogen co-doping, the nanotubular structure of TiO2 nanotube kept its integrity with no significant morphological change, which was beneficial for PEC applications. The degradation efficiency of methyl orange (MO) was examined by photoelectrochemical, photocatalytic, electrochemical and photolysis methods for comparison in terms of pseudo-first-order reaction rate. The PEC method had the best MO dedadation efficiency with a rate constant of 2.3 x 10(-3) s(-1) at a bias potential of 1.0 V (vs. SCE) under illumination, that was consistent with results of IPCE (%) measurements (the maximum IPCE up to 30.02% at 325 nm wavelength). The synergetic effect was quantified at current/time curves at bias potentials of 0.03 mA/0 V and 3.0 mA/1.0 V, respectively. Electrochemical impedance spectroscopy (EIS) measurements revealed the electron lifetime tau(el) of photoexcited electrons in photoanodes was increased about 3.2 times after C-N doping treatment. The bias potential could separate photo-generated holes and electrons effectively and enhance the electrochemical-oxidation of MO. Hydrogen generation was concurrently conducted in the cathodic chamber. After 180 min of reaction time, the amount of H-2 reached 3.2 mmol by employing C-N-TNTAs as the photoanode. (C) 2015 Elsevier B.V. All rights reserved.
机译：使用化学浴沉积法将碳和氮共掺杂到TiO2纳米管阵列（C-N-TNTA）中，以扩展其光响应区域。合成后的C-N-TNTA被用作光电化学（PEC）实验中的工作阳极。使用施加的偏置电势，光生空穴和电子的复合显着减少。 C-N-TNTA的晶体，光学性质，表面形态和结构分别通过XRD，UV-vis吸光度边缘，SEM和XPS表征。 XRD结果表明，在450℃下烧结后，C-N-TNTA主要由锐钛矿相占据，可见光响应明显。 XPS分析表明，氮掺杂是减少带隙的主要原因，这是通过Ti-O-N和N-Ti-O键的键合将0.82％N掺杂到结构中的证据。 SEM图像表明，负载的TiO 2纳米管的直径为约90-100nm，长度为约400nm。碳氮共掺杂后，TiO2纳米管的纳米管结构保持完整性，形态无明显变化，有利于PEC的应用。通过光电化学，光催化，电化学和光解方法研究了甲基橙（MO）的降解效率，以比较拟一级反应速率。 PEC方法在照度为1.0 V（vs. SCE）的条件下，在光照条件下具有2.3 x 10（-3）s（-1）的速率常数，具有最佳的MO复数效率，这与IPCE（％ ）测量（在325 nm波长下最大IPCE高达30.02％）。在电流/时间曲线上分别在0.03 mA / 0 V和3.0 mA / 1.0 V的偏置电势下量化了协同效应。电化学阻抗谱（EIS）测量表明，经过C-N掺杂处理后，光阳极中光激发电子的电子寿命tau（el）增加了约3.2倍。偏置电位可以有效地分离光生空穴和电子，并增强MO的电化学氧化。在阴极室中同时进行氢气的产生。在180分钟的反应时间之后，通过使用C-N-TNTA作为光阳极，H-2的量达到3.2mmol。 （C）2015 Elsevier B.V.保留所有权利。

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